abiword saves document it can't open, inserts duplicate props attributes in xml

[jsnow]

Here is an exerpt of the XML generated when saving a document as .abw:

  If the average node has OL outlinks, then we can expect our naive algorithm to be approximately O(OL</c><c props="" props="text-position:superscript">^</c><c props="text-position:superscript">6</c><c>).

This was text I copy-pasted into abiword. Apparently it decided (correctly in this case) that a carot was supposed to indicate a superscript, but it botched the xml generation, introducing duplicate contradictory "props" for one element.

Abiword will not open this document. Needless to say, I consider it a pretty serious issue when a word processor fails to open a file I had saved from that same program previously.

 xmllint generates the following output:

  provisional-patent.abw:79: parser error : Attribute props redefined
  orithm to be approximately O(OL</c><c props="" props="text-position:superscript"
                                                                               ^
  provisional-patent.abw:79: parser error : Attribute props redefined
  n is that we can turn that O(OL</c><c props="" props="text-position:superscript"
                                                                               ^
  provisional-patent.abw:79: parser error : Attribute props redefined
  erscript">6</c><c>) into O(2*OL</c><c props="" props="text-position:superscrip

I was able to restore the document to a state that could be opened by manually deleting the empty "props" attributes.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: abiword 2.9.2+svn20120213-1
ProcVersionSignature: Ubuntu 3.2.0-54.82-generic 3.2.50
Uname: Linux 3.2.0-54-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.5
Architecture: amd64
Date: Mon Nov 4 18:01:35 2013
EcryptfsInUse: Yes
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: abiword
UpgradeStatus: No upgrade log present (probably fresh install)